WO2015177940A1

WO2015177940A1 - Decorative component and process for producing same

Info

Publication number: WO2015177940A1
Application number: PCT/JP2014/071725
Authority: WO
Inventors: 足立　浩司; 達己落合; 圭佑磯貝
Original assignee: トリニティ工業株式会社
Priority date: 2014-05-20
Filing date: 2014-08-20
Publication date: 2015-11-26
Also published as: US11738594B2; JP6410508B2; US20200047545A1; CN106457883B; US20170087928A1; JP2016000512A; CN106457883A

Abstract

A decorative component (1) for motor vehicles which comprises a molded resin (3) having a decorative layer (2) on a surface layer part thereof and a clear coating layer (4) that protects the surface of the decorative layer (2), the surface of the clear coating layer (4) having high-gloss regions (R1), which have a relatively high gloss, and, intermingled therewith, low-gloss regions (R2), which have a relatively low gloss. The clear coating layer (4) is formed by spraying a clear coating composition over the surface of the decorative layer (2) with an atomization-type coater, the clear coating composition containing an ester-based solvent that is a low-boiling-point solvent having a boiling point below 100°C, as the main solvent, and having a solid content of 35-40 mass%. Thus, the clear coating layer has a surface partly reduced in gloss, and a decorative component having a highly attractive appearance is produced.

Description

Decorative parts and manufacturing method thereof

The present invention relates to a decorative part in which a high-gloss area and a low-gloss area are mixed on the surface of the part, and a manufacturing method thereof.

In automotive interior parts, many decorative parts (for example, console boxes, instrument panels, armrests, etc.) that add decoration to the surface of the resin molded body in order to improve design and quality have been put to practical use. . As a decoration method for adding decoration to such a decorative part, hydraulic transfer is generally used (see, for example, Patent Document 1).

Water pressure transfer is a technique in which a special film is floated on the surface of the water, and a predetermined pattern printed on the film (a pattern such as a wood grain pattern or a geometric pattern) is transferred onto the surface of the resin molded body by water pressure. When this hydraulic transfer is performed, the decorative layer (printing layer) transferred to the surface of the resin molded body is weak and insufficient in durability as compared with the coating film. For this reason, the clear coat layer (surface protective layer) which protects the surface of a decoration layer by performing clear coating is formed. Furthermore, in order to enhance the design of the part surface, a glossy clear coat layer may be formed or a matte clear coat layer may be formed according to the pattern of the pattern.

Incidentally, Patent Document 1 discloses a technique in which a film having an ink layer (decorative layer) is hydraulically transferred, and unevenness is formed on the surface of the component by the repelling action of the ink layer and the collective force of the activator. By forming irregularities on the surface of the component, a visual three-dimensional effect and a tactile three-dimensional effect (uneven texture) can be obtained.

JP 2009-101657 A

By the way, with conventional decorative parts that have been coated with clear coating to form a clear coat layer on the surface of the part, it is in a certain condition (specifically, the entire surface is glossy or the entire surface is delustered) Only glossy expression was possible. For this reason, it has been impossible to perform a visual three-dimensional expression by partially changing the gloss on the surface of the component.

When water pressure transfer is performed using the transfer film of Patent Document 1, irregularities are imparted to the component surface. However, when a clear coat layer for protecting the component surface is formed, there arises a problem that the three-dimensional effect due to the unevenness is impaired. In addition, when the surface protective layer is not formed, the height difference of the protruding portion protruding from the component surface is about 12 μm, and when used for a long period of time, the protruding portion is scraped off due to wear, so that the three-dimensional effect cannot be obtained, and the design property This causes a problem of lowering.

The present invention has been made in view of the above problems, and its purpose is to provide a decorative part excellent in design by partially removing the gloss of the surface in a clear coat layer that protects the decorative layer and its It is to provide a manufacturing method.

In order to solve the above-mentioned problem, the invention described in means 1 includes a component having a decorative layer on a surface layer portion and a clear coat layer for protecting the surface of the decorative layer, on the surface of the clear coat layer. A method for producing a decorative part in which a high-gloss area having a relatively high gloss level and a low-gloss area having a relatively low gloss level are mixed, wherein the decorative layer is formed on a surface layer portion of the part. And a decorative layer forming step in which irregularities are formed on the surface of the decorative layer later on the surface immediately below the low gloss region, and a low boiling point solvent having a boiling point of less than 100 ° C. as a main solvent. Including a clear paint having a solid content of 10% by mass or more and 55% by mass or less, and spraying the clear paint on the surface of the decorative layer with an atomizing coating machine, the surface shape along the unevenness A clear coat layer forming the clear coat layer having the low gloss region. The decorative component manufacturing method which comprises a coating layer formation step and the gist thereof.

According to the invention described in Means 1, the decorative layer is formed on the surface layer part of the component in the decorative layer forming step, and after forming irregularities on the surface of the decorative layer, the clear coat layer forming step is performed. . In the clear coat layer forming step of the present invention, a clear paint having a boiling point of less than 100 ° C. (for example, an ester solvent) as a main solvent and having a solid content of 10% by mass to 55% by mass is used. . This clear paint has a lower boiling point of the main solvent and a lower solid content in the paint as compared with a hydrocarbon-based clear paint generally used conventionally. When this clear paint is sprayed onto the surface of the decorative layer with an atomizing coater, the ester-based main solvent volatilizes before the surface is smoothed, so a clear coat layer is formed along the surface shape of the decorative layer. Is done. As a result, on the surface of the clear coat layer, the region having the unevenness of the decoration layer immediately below becomes a surface shape having fine unevenness, and becomes a low gloss region having a relatively low gloss level. On the other hand, on the surface of the clear coat layer, the region where the decorative layer is not directly below is a flat surface shape, which is a high gloss region having a relatively high gloss level. As described above, in the present invention, the gloss of the low gloss region can be partially dropped on the surface of the component, so that a visual three-dimensional expression corresponding to the decorative layer is possible, and the design of the decorative component is sufficiently achieved. Can be increased.

The clear paint preferably has a solid content of 30% by mass to 50% by mass, and more preferably 35% by mass to 40% by mass. If it does in this way, in the surface of a clear coat layer, the difference of the grade of the glossiness in a low gloss area and a high gloss area becomes large, and the design nature of a decoration part can be improved more.

In the clear coat layer forming step, it is preferable to spray the clear paint under a coating condition in which the atomization pressure of the atomization type coating machine is 0.06 MPa or more and 0.09 MPa or less. Further, it is preferable to spray the clear paint according to the coating conditions in which the discharge amount of the atomizing type coating machine is 50 cc / min or more, and the coating conditions in which the discharge amount of the atomizing type coating machine is from 50 cc / min to 65 cc / min. More preferably, the clear paint is sprayed. Under such application conditions, the particle size of the paint mist sprayed from the atomizing coater becomes large, and the paint is easily adapted to the unevenness of the decorative layer. As a result, the clear coat layer along the uneven shape on the surface of the decorative layer can be more reliably formed.

In the decorative layer forming step, the decorative layer may be formed by hydraulic transfer of a transfer film having irregularities on the pattern layer. In this case, a decorative layer having irregularities can be reliably formed by hydraulic transfer. In the decorative layer forming step, unevenness may be formed on the surface layer portion of the component by embossing, or unevenness may be formed on the surface layer portion of the component by laser processing.

In addition, in the decorative layer forming step, a transfer film formed by laminating a pattern layer for imparting a pattern, a gloss layer for imparting gloss, and a mat layer having irregularities is hydraulically transferred to the decorative layer. You may form the pattern layer used as a decoration layer, a gloss layer, and a mat | matte layer. In this case, in the clear coat layer, the region directly above the unevenness of the mat layer becomes a low gloss region, and the gloss can be surely erased. On the other hand, in the clear coat layer, the region directly above the gloss layer with few irregularities is a high gloss region, and the degree of gloss can be increased. If it does in this way, the three-dimensional effect according to the pattern of the pattern layer can be obtained reliably, and the designability of a decorative part can be improved.

The invention described in Means 2 includes a part having a decorative layer on a surface layer portion and a clear coat layer that protects the surface of the decorative layer, and is relatively glossy on the surface of the clear coat layer. Is a decorative part in which a high-gloss area having a high gloss and a low-gloss area having a relatively low gloss level are mixed, and irregularities are formed on the surface of the decorative layer immediately below the low-gloss area. In addition, the low gloss region of the clear coat layer has a surface shape along the irregularities, the clear coat layer has a surface roughness Ra of 1 μm or less, and the high gloss region and the low gloss region The gist of the decorative part is characterized in that the difference in glossiness is twice or more.

According to the invention described in Means 2, the decorative layer has a decorative layer on the surface layer portion, and the surface of the decorative layer is protected by the clear coat layer. And the area | region which has the unevenness | corrugation of a decoration layer directly under the surface of a clearcoat layer turns into a surface shape along the unevenness | corrugation, and becomes a low glossiness area | region where the degree of gloss is relatively low. On the other hand, on the surface of the clear coat layer, the region where the decorative layer is not directly below is a flat surface shape, which is a high gloss region having a relatively high gloss level. In the decorative part of the present invention, since the difference in glossiness between the high gloss area and the low gloss area on the clear coat layer surface is more than twice, visual three-dimensional expression is possible and the design is sufficiently enhanced. be able to. In addition, since the surface roughness Ra of the clear coat layer is 1 μm or less, there is little change in stereoscopic effect due to wear on the surface of the component, and the design of the decorative component can be maintained in a good state even when used for a long time. it can.

It is preferable that the mat layer constituting the decorative layer has a surface roughness Ra of 2 μm or less. By applying a clear paint on the mat layer, the surface roughness Ra of the clear coat layer can be 1 μm or less. Moreover, it is preferable that a mat layer is comprised including the same pigment as the pigment contained in the handle layer formed in the lower layer side. In this case, unevenness according to the pattern can be reliably imparted. Specifically, when the pattern is a woodgrain pattern, a matte layer is formed in a portion corresponding to the grain node. In this case, a stereoscopic effect corresponding to the actual grain can be obtained.

As the gloss layer constituting the decorative layer, a transparent resin layer made of, for example, an acrylic polyol resin or the like is suitable, and is formed with a uniform thickness over the entire surface of the pattern layer to which the pattern is applied. By forming the gloss layer in this way, gloss can be surely imparted to the pattern of the pattern layer.

Further, on the surface of the clear coat layer, it is preferable that the gloss value indicating the glossiness of the high gloss region is 30 or more and the gloss value of the low gloss region is 10 or less. Thus, by increasing the difference in glossiness on the surface of the clear coat layer, the three-dimensional effect of the decorative part can be obtained with certainty.

As described in detail above, according to the invention described in

Means

1 or 2, the gloss of the surface of the clear coat layer can be partially reduced, and the design of the decorative part can be enhanced.

The top view which shows a part of decoration component for motor vehicles of one Embodiment. The expanded sectional view which shows the decoration component for motor vehicles of one Embodiment. Explanatory drawing which shows a decoration layer formation process. Explanatory drawing which shows a clear coat layer formation process. Explanatory drawing which shows the surface of the sample goods used as the reference | standard of a characteristic value. The graph which shows the relationship between solid content and expression property. The graph which shows the relationship between the main solvent boiling point and expression property. The graph which shows the relationship between atomization pressure and expression property. Graph showing the relationship between solid content and expression The graph which shows the relationship between atomization pressure and expression property. Explanatory drawing which shows the SEM photograph of the decorative component for motor vehicles of this Embodiment.

Hereinafter, an embodiment in which the present invention is embodied in a decorative part for an automobile will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, an automotive decorative component 1 includes a resin molded body 3 (component) having a decorative layer 2 on a surface layer portion, and a clear coat layer 4 that protects the surface of the decorative layer 2. And. The automotive decorative component 1 is an interior component that constitutes an armrest of a door. The decorative layer 2 includes a handle layer 5, a gloss layer 6, and a mat layer 7, and is formed on the surface layer portion of the resin molded body 3 by hydraulic transfer. In the present embodiment, the pattern layer 5 has a thickness of about 4 μm, the gloss layer 6 has a thickness of about 1 μm, and the mat layer 7 has a thickness of about 2 μm.

The pattern layer 5 is a printing layer for applying the pattern 8 and includes nitrocellulose and a pigment. In the pattern layer 5 of the present embodiment, for example, a woodgrain pattern 8 is drawn. The gloss layer 6 is a transparent resin layer formed in order to give gloss to the pattern 8 of the pattern layer 5, and is made of, for example, an acrylic polyol resin. The gloss layer 6 is provided on the upper layer side of the handle layer 5 and is formed with a uniform thickness on the entire surface thereof. The mat layer 7 is a matte layer provided on the upper side of the gloss layer 6 and is formed at a position corresponding to the pattern 8 of the pattern layer 5, specifically, at a position corresponding to a node of the grain. The mat layer 7 is configured to include nitrocellulose, a pigment, and silica, and the unevenness 7a is formed on the surface thereof. The mat layer 7 has a surface roughness Ra of about 1 μm. Further, the pigment of the mat layer 7 includes the same pigment (specifically, black pigment) as the handle layer 5 formed on the lower layer side.

The clear coat layer 4 formed on the uppermost layer of the automobile decorative part 1 is formed by applying a transparent clear paint containing a matting agent. The thickness of the clear coat layer 4 is about 10 μm to 30 μm, and is formed along the uneven shape on the surface of the mat layer 7.

In the automotive decorative component 1 of the present embodiment, the surface of the clear coat layer 4 has a high gloss region R1 having a relatively high gloss level and a low gloss region R2 having a relatively low gloss level. Mixed. Specifically, on the surface of the clear coat layer 4, the mat layer 7 (unevenness 7 a) is formed immediately below the low gloss region R 2, and the fine unevenness 4 a is formed on the surface of the low gloss region R 2. Is done. Further, the mat layer 7 is not formed immediately below the high gloss region R1, and the surface of the high gloss region R1 is a flat surface.

In the surface layer portion of the decorative part 1 for automobiles, the unevenness 4a is formed on the surface of the clear coat layer 4 in the portion where the mat layer 7 is formed according to the pattern 8 (low gloss region R2 corresponding to the node of the grain). The For this reason, the gloss level of the low gloss region R2 is low, and the gloss value indicating the glossiness is about 10. On the other hand, the gloss layer 6 is exposed in the high gloss region R1 where the mat layer 7 is not formed. For this reason, the glossiness of the high gloss region R1 becomes high, and the gloss value indicating the glossiness is about 30. Thus, in the automotive decorative component 1 of the present embodiment, the luster is reduced in the portion corresponding to the node of the wood grain in the woodgrain pattern 8, so that the same three-dimensional effect as the actual wood grain is obtained.

In addition, the fine unevenness 4a on the surface of the clear coat layer 4 is an unevenness that cannot be recognized by touch feeling with a hand. Specifically, the surface roughness Ra of the clear coat layer 4 is 1 μm or less even in the low gloss region R2 where the fine irregularities 4a are present.

Next, the manufacturing method of the automotive decorative part 1 in the present embodiment will be described.

First, after preparing a resin molding 3 molded into a predetermined three-dimensional shape using a resin material (for example, ABS resin), a decoration layer forming step is performed. In the decorative layer forming step, the pattern layer 5, the gloss layer 6 and the mat layer 7 constituting the decorative layer 2 are transferred to the surface layer portion of the resin molded body 3 by water pressure using a hydraulic transfer device (see FIG. 3). ). More specifically, the water pressure transfer apparatus is provided with a transfer tank for storing treated water. The hydraulic transfer device floats a transfer film (not shown) formed with a mat layer 7, a gloss layer 6 and a handle layer 5 on a substrate on the surface of treated water in a transfer tank, and in that state, above the transfer film. Then, the resin molded body 3 is pressed. Thereby, the pattern layer 5, the gloss layer 6, and the mat layer 7 are transferred onto the surface of the resin molded body 3 by water pressure. As a result, the pattern layer 5 is formed on the surface layer portion of the resin molded body 3, and the unevenness 7 a of the mat layer 7 is formed at a location directly below the low gloss region R <b> 2 later.

After that, clear coating is performed as a clear coat layer forming process. Specifically, as shown in FIG. 4, the decorative layer 2 (the pattern layer 5, the gloss layer 6, and the mat layer 7) is formed by spraying the transparent clear paint P <b> 1 using the atomization type coating machine 11. The clear coat layer 4 is applied to the surface of the formed resin molded body 3. In the clear coating, an ester-based clear paint P1 containing a low-boiling solvent having a boiling point of 70 ° C. to 90 ° C. (in this embodiment, ethyl acetate) as a main solvent is used. More specifically, as the clear paint P1, a two-component urethane paint containing a solid content (such as a matting agent or a resin material) at a ratio of 35% by mass to 40% by mass is used. In addition, here, the distance (gun distance) between the discharge port 12 of the atomizing type coating machine 11 and the surface of the resin molded body 3 is 100 mm, depending on the coating conditions where the discharge amount is 50 cc / min and the atomization pressure is 0.08 MPa. In this state, four times of overcoating are performed. Thereafter, the resin molded body 3 is placed in a drying device (not shown), and the clear coat layer 4 is dried at a temperature of about 80 ° C. As a result, the clear coat layer 4 having the low gloss region R2 of the surface shape along the unevenness 7a of the mat layer 7 is formed, and the automobile decorative part 1 as shown in FIGS. 1 and 2 is manufactured.

The present inventor conducted a coating experiment in order to determine the optimum conditions for clear coating. In the painting experiment, factors estimated to contribute to the degree of gloss and matte appearance (GM development degree), specifically, the solid content ratio of the clear paint P1, the boiling point of the main solvent of the clear paint P1, the discharge amount, The atomization pressure, gun distance, and the number of coatings were used as experimental factors, and the coating experiment was performed with these factors changed. Here, the resin molding 3 in which the decorative layer 2 was formed by the above-described manufacturing method (hydraulic transfer or the like) was used, and the conditions were the same except for clear coating.

Table 1 shows the levels of the factors A to F and the factors A to F changed in the coating experiment, and Table 2 shows the experimental results.

As an experimental result, the GM expression degree on the surface of the clear coat layer 4 (the surface of the decorative part 1) after the painting was sensitively evaluated, and the evaluation result is shown in Table 2 as five-stage characteristic values. More specifically, as shown in FIG. 5, a sample product serving as a reference for the degree of GM expression (characteristic values 1 to 5) is prepared in advance, and the decorative part 1 (experiment No. 1) obtained in the painting experiment is prepared. 1 to No. 16) are compared with the GM expression level of the surface and the GM expression level of the sample product, and the matching GM expression level is visually determined. The characteristic value indicating the degree of GM expression is “1” when the expression is the worst and “5” when the expression is the best.

Based on the experimental results shown in Table 2, analysis of variance was performed. The analysis results are shown in the ANOVA table of Table 3.

As shown in Table 3, there was a significant difference in the solid content of factor A, the boiling point of the main solvent of factor B, and the atomization pressure of factor D, and it was found that these factors contributed to the GM expression. More specifically, the ratio of the solid content of factor A is significant at a significance level of 1%, and as shown in FIG. 6, the clear paint P1 having a low solid content ratio (the solid content is 30% by mass to 40% by mass). ), The GM expression is improved. The boiling point of the main solvent of factor B is significant at a significant level of 1%. As shown in FIG. 7, the clear paint P1 having a low main solvent boiling point (ester-based solvent having a main solvent boiling point of 70 ° C. to 90 ° C.) is used. When a clear paint is used, the GM expression is improved. Furthermore, the atomization pressure of factor D is significant at a significance level of 5%. As shown in FIG. 8, when the atomization pressure is lowered, the GM expression is improved.

Next, in order to determine the optimum conditions for the ratio of the solid content of factor A contributing to the GM expression and the atomization pressure of factor D, coating experiments were performed with finely changing levels. Table 4 shows the factors A and D and the levels of the factors A and D changed in the coating experiment, and Table 5 shows the experimental results. The other factors B, C, E, and F were fixed conditions. Specifically, the conditions such that the boiling point of the main solvent of factor B is 70 ° C to 90 ° C, the discharge amount of factor C is 50 cc / min, the gun distance of factor E is 100 mm, and the number of coating times of factor F is four times are fixed. Then, the painting experiment was performed by changing the levels of the factors A and D.

Then, analysis of variance is performed based on the experimental results shown in Table 5, and the analysis results are shown in the analysis of variance table of Table 6.

As shown in Table 6, the ratio of the solid content of factor A is significant at the significance level of 5%, and when the ratio of the solid content is 35% by mass to 40% by mass as shown in FIG. GM expression was the best. In addition, the atomization pressure of factor D was significant at a significance level of 1%, and as shown in FIG. 10, when the atomization pressure was 0.08 MPa, GM expression was the best.

Therefore, in the present embodiment, an ester-based clear paint P1 having a solid content of 35 mass% to 40 mass% and a main solvent boiling point of 70 ° C. to 90 ° C. is used, and the discharge amount is 50 cc / min. Clear coating was performed under the conditions that the atomization pressure was 0.08 MPa, the gun distance was 100 mm, and the number of overcoating was four. As a result, the decorative part 1 for an automobile having gloss and matting is produced.

In the automobile decorative part 1 of the present embodiment manufactured as described above, the cross section was confirmed using a scanning electron microscope (SEM). In FIG. 11, the SEM photograph of the cross section of the decorative component 1 for motor vehicles is shown. As shown in FIG. 11, the high gloss region R1 in the clear coat layer 4 has a smooth surface because the mat layer 7 does not exist immediately below. On the other hand, in the low gloss region R2 in the clear coat layer 4, since the mat layer 7 exists immediately below, the fine unevenness 4a is formed on the surface.

Therefore, according to the present embodiment, the following effects can be obtained.

(1) In the clear coating of the present embodiment, a clear paint P1 containing an ester solvent as a low-boiling solvent having a boiling point of less than 100 ° C. as a main solvent and having a solid content of 35% by mass to 40% by mass. Used. This clear paint P1 has a lower boiling point of the main solvent compared to the conventionally used hydrocarbon-based clear paint (boiling point 110 ° C. to 140 ° C., solid content 50 mass% to 60 mass%). There is less solid content in the paint. When this clear paint P1 is sprayed onto the surface of the component by the atomizing coater 11, the main solvent of the ester is volatilized before the surface is smoothed. Therefore, the clear paint along the surface shape of the mat layer 7 in the decorative layer 2 is cleared. Coat layer 4 is formed. As a result, on the surface of the clear coat layer 4, the region having the unevenness 7 a of the mat layer 7 immediately below becomes a surface shape having fine unevenness 4 a and becomes a low gloss region R <b> 2 having a relatively low gloss. On the other hand, on the surface of the clear coat layer 4, a region where the unevenness 7 a of the mat layer 7 is not directly below becomes a flat surface shape and becomes a high gloss region R 1 having a relatively high gloss level. As described above, in the present embodiment, the gloss of the low gloss region R2 can be partially removed on the surface of the clear coat layer 4, so that the visual according to the decorative layer 2 (the pattern 8 of the pattern layer 5) is visually reduced. 3D expression is possible, and the design of the decorative part 1 for automobiles can be sufficiently enhanced. In the present embodiment, the clear paint P1 having a solid content of 35% by mass or more and 40% by mass or less is used as the optimum condition. When the range of conditions is widened with respect to this optimum condition, specifically, even when a clear paint having a solid content of 10% by mass or more and 55% by mass or less is used, compared with the conventional decorative part 100 for automobiles. Thus, it was possible to produce a decorative part 1 for an automobile having gloss and mattness.

(2) In the clear coating of the present embodiment, when the clear paint P1 is sprayed under the coating conditions in which the atomization pressure of the atomization type coating machine 11 is 0.06 MPa or more and 0.09 MPa or less, the atomization type coating machine 11 The particle size of the paint mist sprayed from the inside becomes large, and the paint P1 becomes easy to become familiar with the unevenness 7a of the mat layer 7. As a result, the clear coat layer 4 along the uneven shape on the surface of the mat layer 7 constituting the decorative layer 2 can be more reliably formed.

(3) In the decorative layer forming step of the present embodiment, the decorative layer 2 (pattern layer 5, gloss layer 6 and mat layer 7) is obtained by hydraulically transferring the transfer film to the surface layer portion of the resin molded body 3. After forming, the clear coat layer 4 is formed by clear coating. If it does in this way, the decoration layer 2 which has the unevenness | corrugation 7a of the mat | matte layer 7 in the position corresponding to the grain-like pattern 8 of the pattern layer 5 can be reliably formed in the surface layer part of the resin molding 3. FIG. Further, in this case, in the clear coat layer 4, the region immediately above the irregularities 7 a of the mat layer 7 formed according to the pattern 8 of the pattern layer 5 becomes the low gloss region R 2, and the gloss can be surely erased. On the other hand, in the clear coat layer 4, the gloss layer 6 is exposed in the area where the mat layer 7 is not formed, so that it becomes a high gloss area R <b> 1 and the gloss level can be increased. If it does in this way, the three-dimensional effect according to the pattern 8 (wood grain) of the pattern layer 5 can be obtained reliably, and the design property of the decorative part 1 for motor vehicles can be improved.

(4) In the automobile decorative component 1 of the present embodiment, the difference in glossiness between the high gloss region R1 and the low gloss region R2 on the surface of the clear coat layer 4 is three times, so that the visual three-dimensional expression Can be achieved, and the design can be sufficiently enhanced. Moreover, since the surface roughness Ra of the clear coat layer 4 is 1 μm or less, there is little change in the three-dimensional effect due to wear on the surface of the component, and the design of the decorative component 1 for automobiles is kept in a good state even after long-term use. Can be maintained.

The embodiment of the present invention may be modified as follows.

In the above embodiment, in the decorative layer forming step, the decorative layer 2 is formed by hydraulically transferring a transfer film having the unevenness 7a of the mat layer 7 on the handle layer 5 to the surface layer portion of the resin molded body 3. Although formed, it is not limited to this. For example, unevenness may be formed on the surface layer portion of the resin molded body 3 by embossing, or unevenness may be formed on the surface layer portion of the resin molded body 3 by laser processing. In this case, the surface layer portion where unevenness is formed in the resin molded body 3 is a decorative layer. Moreover, after forming the coating-film layer as a decoration layer by coating on the surface layer part of the resin molding 3, you may form the unevenness | corrugation by laser processing in the coating-film layer. Furthermore, you may form an unevenness | corrugation in the surface layer part (coating layer) of the resin molding 3 by sandblasting, shot blasting, etc.

In the above embodiment, a two-component urethane paint is used as the clear paint, but a one-component urethane paint may be used. Of course, other clear paint such as acrylic paint may be used in addition to urethane paint.

In the above embodiment, the decorative part 1 for an automobile is embodied as an armrest of a door, but other than this, it may be embodied as a decorative part such as a console box or an instrument panel. Of course, you may embody this invention in decorative parts, such as decorative panels, such as furniture and a household appliance, besides the decorative parts for motor vehicles.

Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

(1) In the first means, in the clear coat layer forming step, the clear paint is sprayed under a coating condition in which a discharge amount of the atomizing coater is 50 cc / min or more and 65 cc / min or less. Manufacturing method of decorative parts.

(2) In means 1, in the decorative layer forming step, a transfer film is formed by laminating a pattern layer for imparting a pattern, a gloss layer for imparting gloss, and a mat layer having the irregularities. A method for producing a decorative part, wherein the pattern layer, the gloss layer, and the mat layer to be the decorative layer are formed by hydraulic transfer.

(3) In the technical idea (2), the mat layer has a surface roughness Ra of 2 μm or less.

(4) In the technical idea (2), the mat layer is configured to include the same pigment as the pigment included in the handle layer formed on the lower layer side thereof. Method.

(5) In the technical idea (2), the pattern is a woodgrain pattern, and the mat layer is formed in a portion corresponding to a node of the wood grain.

(6) In the technical idea (2), the gloss layer is a transparent resin layer made of an acrylic polyol resin, and is formed with a uniform thickness on the entire surface of the pattern layer to which the pattern is applied. A method for producing a decorative part characterized by the above.

(7) A method for manufacturing a decorative part in the means 1, wherein the gloss value indicating the glossiness of the high gloss region is 30 or more and the gloss value of the low gloss region is 10 or less.

(8) The method of manufacturing a decorative part according to means 1, wherein, in the decorative layer forming step, irregularities are formed on a surface layer portion of the part by embossing.

(9) The method for manufacturing a decorative part according to means 1, wherein in the decorative layer forming step, irregularities are formed on a surface layer portion of the part by laser processing.

(10) The method of manufacturing a decorative part according to means 1, wherein the decorative part is a decorative part for an automobile.

DESCRIPTION OF SYMBOLS 1 ... Decorative part for automobiles as a decorative part 2 ... Decorative layer 3 ... Resin molded body 4 as part ... Clear coat layer 5 ... Pattern layer 7a ... Concavity and convexity 11 ... Atomization type coating machine P1 ... Clear paint R1 ... High gloss area R2 ... Low gloss area

Claims

A component having a decorative layer on the surface layer portion, and a clear coat layer that protects the surface of the decorative layer, on the surface of the clear coat layer, a high gloss region having a relatively high gloss level, and a relative A method for manufacturing a decorative part in which a low gloss region with a low gloss level is mixed,
The decorative layer forming step of forming the decorative layer on the surface layer of the component, and forming irregularities in a location directly below the low gloss area later on the surface of the decorative layer;
Using a clear paint having a low boiling point solvent having a boiling point of less than 100 ° C. as a main solvent and having a solid content of 10% by mass to 55% by mass, the clear paint is applied to the surface of the decorative layer by an atomizing coating machine And a clear coat layer forming step of forming the clear coat layer having the low gloss region of the surface shape along the irregularities by spraying on the surface.
The method for producing a decorative part according to claim 1, wherein the clear paint has a solid content of 35% by mass or more and 40% by mass or less.
3. The clear coating layer forming step, wherein the clear paint is sprayed under a coating condition in which an atomizing pressure of the atomizing coating machine is 0.06 MPa or more and 0.09 MPa or less. The manufacturing method of the decorative component of description.
4. The clear coating layer forming step, wherein the clear paint is sprayed under a coating condition in which a discharge amount of the atomizing coating machine is 50 cc / min or more. The manufacturing method of the decorative component of description.
5. The clear coating layer forming step, wherein the clear paint is sprayed under a coating condition in which a discharge amount of the atomizing coating machine is 50 cc / min or more and 65 cc / min or less. The manufacturing method of the decorative component of Claim 1.
The said decoration layer formation process forms the said decoration layer by carrying out the hydraulic transfer of the transfer film which has the said unevenness | corrugation on a pattern layer, The addition of any one of Claim 1 thru | or 5 characterized by the above-mentioned. A method for manufacturing decorative parts.
In the decorative layer forming step, the transfer film formed by laminating a pattern layer for imparting a pattern, a gloss layer for imparting gloss, and a mat layer having the unevenness is hydraulically transferred, The method for manufacturing a decorative part according to any one of claims 1 to 6, wherein the pattern layer, the gloss layer, and the mat layer that are to be decorated layers are formed.
The method for manufacturing a decorative part according to claim 7, wherein the mat layer has a surface roughness Ra of 2 µm or less.
The method for manufacturing a decorative part according to claim 7 or 8, wherein the mat layer is configured to include the same pigment as the pigment included in the handle layer formed on the lower layer side.
The method of manufacturing a decorative part according to any one of claims 7 to 9, wherein the pattern is a grain-like pattern, and the mat layer is formed at a portion corresponding to a node of the grain.
The gloss layer is a transparent resin layer made of acrylic polyol resin, and is formed with a uniform thickness over the entire surface of the pattern layer to which the pattern is applied. The manufacturing method of the decorative component of Claim 1.
12. The decoration according to claim 1, wherein the gloss value indicating the glossiness of the high gloss region is 30 or more, and the gloss value of the low gloss region is 10 or less. Manufacturing method of parts.
The method for manufacturing a decorative part according to any one of claims 1 to 5, wherein, in the decorative layer forming step, the unevenness is formed on a surface layer portion of the part by a texture process.
The method for manufacturing a decorative part according to any one of claims 1 to 5, wherein, in the decorative layer forming step, the irregularities are formed on a surface layer portion of the part by laser processing.
A component having a decorative layer on the surface layer portion, and a clear coat layer that protects the surface of the decorative layer, on the surface of the clear coat layer, a high gloss region having a relatively high gloss level, and a relative It is a decorative part that is mixed with a low gloss area with a low gloss level.
Concavities and convexities are formed at locations immediately below the low-gloss area on the surface of the decorative layer, the low-gloss area of the clear coat layer has a surface shape along the irregularities, and the clear coat layer is A decorative part having a surface roughness Ra of 1 μm or less and a difference in glossiness between the high gloss region and the low gloss region is twice or more.
The decorative part according to claim 15, wherein the decorative layer includes a pattern layer for imparting a pattern, a gloss layer for imparting gloss, and a mat layer having the unevenness.
The decorative part according to claim 16, wherein the mat layer has a surface roughness Ra of 2 µm or less.
The decorative part according to claim 16 or 17, wherein the mat layer is configured to include the same pigment as the pigment included in the handle layer formed on a lower layer side thereof.
The decorative part according to any one of claims 16 to 18, wherein the pattern is a woodgrain pattern, and the mat layer is formed at a portion corresponding to a node of the wood grain.
The gloss layer is a transparent resin layer made of an acrylic polyol resin, and is formed with a uniform thickness over the entire surface of the pattern layer to which the pattern is applied. The decorative part according to item 1.
21. The decoration according to claim 16, wherein the gloss value indicating the glossiness of the high gloss region is 30 or more, and the gloss value of the low gloss region is 10 or less. parts.